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Ben Chifley Dam Catchment, Australia Lachlan T Brigham Young University BYU ScholarsArchive 1st International Congress on Environmental International Congress on Environmental Modelling and Software - Lugano, Switzerland - Modelling and Software June 2002 Jul 1st, 12:00 AM Integrated Water Quality Modelling: Ben Chifley Dam Catchment, Australia Lachlan T. H. Newham R. A. Letcher A. J. Jakeman A. L. Heathwaite C. J. Smith See next page for additional authors Follow this and additional works at: https://scholarsarchive.byu.edu/iemssconference Newham, Lachlan T. H.; Letcher, R. A.; Jakeman, A. J.; Heathwaite, A. L.; Smith, C. J.; and Large, D., "Integrated Water Quality Modelling: Ben Chifley aD m Catchment, Australia" (2002). International Congress on Environmental Modelling and Software. 46. https://scholarsarchive.byu.edu/iemssconference/2002/all/46 This Event is brought to you for free and open access by the Civil and Environmental Engineering at BYU ScholarsArchive. It has been accepted for inclusion in International Congress on Environmental Modelling and Software by an authorized administrator of BYU ScholarsArchive. For more information, please contact [email protected], [email protected]. Presenter/Author Information Lachlan T. H. Newham, R. A. Letcher, A. J. Jakeman, A. L. Heathwaite, C. J. Smith, and D. Large This event is available at BYU ScholarsArchive: https://scholarsarchive.byu.edu/iemssconference/2002/all/46 Integrated Water Quality Modelling: Ben Chifley Dam Catchment, Australia L.T.H. Newhama, R.A. Letcherb, A.J. Jakemana.b, A.L. Heathwaitec, C.J. Smitha and D. Larged a Centre for Resource and Environmental Studies, The Australian National University, Canberra ACT 0200, Australia b Integrated Catchment Assessment and Management Centre, The Australian National University c Department of Geography, University of Sheffield, UK d New South Wales Environment Protection Authority Abstract: This paper describes an integrated hydrologic, stream sediment and nutrient export modelling system. The modelling system is designed to simulate catchment-scale land and water management activities in the Ben Chifley Dam Catchment (BCDC). The dam has experienced problematic blue-green algal blooms over the past decade. The aim of the modelling is to examine management scenarios designed to reduce nutrient and sediment delivery from the BCDC. This paper describes the framework of the system along with brief description of each of the various components. The innovation of the modelling system is the integration of otherwise separate modelling approaches. The output of the project will be methods to focus both on-ground ameliorative action at specific sites and encourage sustainable management practices more broadly in the catchment. Keywords: Integrated modelling; Nutrient management; Model framework 1. INTRODUCTION long-term project that includes catchment monitoring, and links with a study investigating This paper describes an environmental modelling the in-storage dynamics of the Dam. system under development for the Ben Chifley Dam Catchment (BCDC), Australia. The modelling system is designed to simulate land and 2. CATCHMENT DESCRIPTION water management activities within the catchment. The model integrates hydrologic, stream sediment The BCDC is an upland catchment of the and nutrient export models to enable the Macquarie River, part of the Murray-Darling development and evaluation of management Basin of south-eastern Australia. The BCDC has a scenarios designed to reduce nutrient and sediment total area of 985km2 and is the primary source of delivery to the dam. This paper describes the potable water for the city of Bathurst located 20km framework used to construct the integrated model, to the north. The catchment has a total population and reports on current progress. of approximately 700; Rockley and Black Springs Over the past decade the Ben Chifley Dam has are the only notable population centres within the experienced frequent and problematic blue-green catchment. Figure 1 shows the location of the algal blooms [Tooth unpublished report]. BCDC and highlights the drainage network of the Reduction of nutrient delivery to the dam is one of catchment. the primary management options available to limit The BCDC is used predominantly for the the frequency of algal blooms. Tools are required extensive production of sheep and beef cattle. to focus both ameliorative on-ground action at Grazing occurs on both native and exotic pastures. specific sites and to encourage sustainable Approximately 14% of the catchment is forested, management practices more broadly in the with commercial forestry plantations (almost catchment. The development of the modelling exclusively Pinus radiata) covering the majority system described here is a major component of a of this area, the remainder of the forested area is 275 remnant or regrowth native forest. Less than 1% of The modelling system we are developing to the catchment used for cropping. Over recent years quantify sediment and nutrient delivery to the Ben there have been steady increases in wine grape Chifley Dam needs to satisfy the following production, however, viticultural areas cover only criteria: a minor proportion of the total catchment area. • adequate simulation of hydrologic and biogeochemical processes under current management conditions; • identification of catchment areas that currently, or potentially, contribute high loads of nutrients or sediment to streams: so called Critical Source Areas [Heathwaite et al. 2000]; • potential to simulate the impact of current and future land management practices on nutrient and sediment loads reaching surface waters; • sensitivity to climate variability; • an ability for on-going comprehensive testing including assessment of the sensitivity of inputs and assumptions; and • ready incorporation of socio-economic modelling criteria to enable prioritising of ameliorative strategies. The modelling system has been constrained to a Figure 1. Location of the Ben Chifley Dam level of complexity not exceeding data availability Catchment. or process understanding, for example rainfall data constrains the temporal scale of the modelling Water quality decline is a major environmental system to running at a daily interval. Management degradation concern in the BCDC [Rogers prescription will extend to the sub-catchment unpublished report]. The decline is manifest in an scale, in the order of 10's km2. Spatial outputs in increased delivery of sediment and nutrient particular are important in the context of providing enrichment of streams and water storages. management prescription. Increased sediment supply through soil erosion can be attributed to the cumulative effects of The primary catchment drivers that are extensive clearing of native vegetation and encapsulated within the modelling system are: inappropriate agricultural and riparian • climate; management practices since European settlement in the 1820's [Wasson et al. 1996]. Gully and • hydrology; streambank sources of soil erosion are predominant in the catchment. Gully erosion has • land use and management practices; and been found to contribute 73% of the total sediment • riparian management. yield to the stream system annually [Rogers unpublished report]. Gully erosion has the The modelling system explicitly considers both probable and undesirable secondary influence of particulate and soluble forms of nutrient transport. accelerating the delivery of diffuse hillslope Consideration of particulate and soluble nutrient nutrient sources to the stream network. The mean transport has been necessary for two reasons: gully density of the catchment has been calculated firstly the dominant source of nutrient transport as 2.55m/ha (unpublished data). A recent study of cannot be determined from the available water the location of gullies in the BCDC has revealed quality data and secondly the methods developed that attributes such as lithology, soil type, slope in the project will be applied more broadly in and elevation are the major factors controlling the Australian catchments. formation of gullies [Smith 2002]. The modelling system is based on a series of linked river reaches. Where possible, river reaches will coincide with the spatial units at which the 3. MODEL FRAMEWORK 276 drivers of erosion and nutrient delivery are thought nitrogen and phosphorus risk indexes [Heathwaite to converge. Identification of the appropriate reach et al. 2000], (iii) stream longitudinal elevation structure of the modelling network has already profiles, and (iv) field observation. It is anticipated commenced. Allocation of reaches is based on that individual reaches in the modelling network information derived from the application of the will be 2-5km in length. following: (i) sediment modelling using a modified A diagram of the model framework for a single SedNet model [Prosser et al. 2001], (ii) modified reach is shown in Figure 2. Figure 2. BCDC model framework showing model components for a particular stream reach. The remainder of this section describes specific and sub-surface discharge in the modelling components of the model and reports on progress. network. 3.1 Spatial Data A comprehensive spatial database has been developed for the catchment within the ARCINFO GIS package. Queries of the database provide the inputs to a number of sub-models of the system, in particular the sediment sub-model and nutrient risk indexes. Table 1 provides a summary of the various data sets contained within the spatial database. Table 1. BCDC spatial database.
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